The Red Key

Nicholas and Karen's father were partners until Karen's father suddenly vanished

Hester tells Karen the door in the room concealed by a drape has not been opened for seven years

Hester claims a key on a red ribbon in Nicholas's possession opens the door

And that there is a corpse hidden there!

Remembering it was seven years ago that her father disappeared, Karen's suspicion increases and the red key becomes a symbol of fear and mistrust